. >>> also new at an a an abc news source says lance armstrong is being investigated by federal authorities. it is part of a criminal investigation. the source says they are looking into charges of obstruction, witness tampering and intimidation by armstrong. his fellow cyclists have said armstrong coerced them into using performance enhancing drugs. armstrong was cleared of charges in southern california and today the same attorney reiterated that armstrong would not be charged. but an abc news source says the attorney does not speak for the federal government as a whole. >>> gas prices nationwide have jumped 18 cents in a week. that's the biggest seven-day spike in nearly two years time. the average price for a gallon of regular is now $3.54 a gallon. experts blame it on rising oil prices and tension in the middle east. here in california of course it is even higher, $3.91 a gallon. that's in part because refineries are preparing to switch from winter grade to summer grade fuel. san francisco typically has some of the highest gas prices in the state. but look at pump prices in los angeles